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Hydroseeding over an existing lawn is possible, but certain adjustments are necessary since the process is for bare soil. Hydroseed mix is ​​usually very thick, which helps protect the seeds during germination. If you have existing grass on your site and still want to hydroseed, it's better to use a finer mulch mixture when spraying. A finer mulch mix means the seeds can root into existing soil without suffocating the existing grass.

The frequency of lawn aeration depends on factors such as soil type, yard traffic, and lawn health. In most cases, annual aeration is sufficient to maintain a healthy lawn. However, if your lawn experiences heavy use or soil compaction issues, you may consider aerating twice a year. Keep an eye on your grass and soil conditions to determine when aeration is needed to keep your lawn in its best shape.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.

If your lawn has some lumps and bumps, yes, aeration can help—although it may also be beneficial to take on other steps, like irrigation, fertilization, and dethatching (also known as scarifying). You can also use a power rake to physically break up the bumps in your lawn, which can help you achieve a more even look.